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  * A translation may be found [http://neo-classical-physics.info/uploads/3/0/6/5/3065888/caratheodory_-_thermodynamics.pdf here]. A partly reliable translation is to be found at Kestin, J. (1976). The Second Law of Thermodynamics, Dowden, Hutchinson & Ross, Stroudsburg PA.
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  *Planck. M. (1914). [https://archive.org/details/theoryofheatradi00planrich The Theory of Heat Radiation], a translation by Masius, M. of the second German edition, P. Blakiston's Son & Co., Philadelphia.